Arc-lamp hanger.



No. 755,797. PATENTED MAR. 29, 1904.,

' H. R. SARGENT.

ARC LAMP HANGER.

APPLICATION FILED SEPT. 2, 1902.

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H. R. SARGENT, ARG LAMP HANGER.

APPLIOATION FILED, SEPT. 2, 1902.

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UNITED STATES Patented Maren 29, 1904.

PATENT ()FFICE.

HOWARD R. SARGENT, .OF SCHENECTADY, NEW YORK, ASSIGNOR 'TO GENERAL ELECTRIC COMPANY, A CORPORATION OF NEW YORK.

- ARC-LAMP HANGER.

SPECIFICATION forming part of Letters Patent No. 755,797, dated March 29, 1904. Application filed September 2, 1902. Serial No. 121,731. (No model.)

To calla/17mm it may concern:

vBe itknown that I, HOWARD R. SARGENT, a citizen of the United States, residing at Schenectady, county of Schenectady, State of New York, have invented certain new and useful Improvements in Arc-Lamp Hangers, of which the following 1s a specification. This invention relates to electric lighting;

and its object is to enable an arc-lamp to be automatically attached to and detached from a support by simply pulling on the cord by which it is raised and lowered. The device is so arranged that when the lamp is detached 4 from the support acut-out switch will be antomatically closed'to preserve the electrical continuity of the line. by means of an improved hanger consisting of-two separable portions, one suspended from a guys wire orother supportand the other attached to the lamp. The latter is provided with a cam groove or shoulder which when said portion is raised by the cord fastened thereto will engage with a pin in the upper portion and automatically guide said pin into "tion, of my improved hanger, taken on the lines 1 1, Figs. 2 and 1. Fig. 2 is a bottom plan view of the upper portion. Fig. 3 is a top plan view of the lower portion. Fig. 1 is a side elevation, partly broken away. Fig. 5 is a side elevation of a lamp equipped with my hanger, and Fig. 6 is a development of the cams and notches on the upper end of the attaching-plug.

The hanger comprises a pendant 1, having an eye 2 to slide on or be suspended by a wire or rod 3 and serving as a housing for a pulley by simply pulling on the cord 5.

I attain these results A, over which runs a cord 5 for raising and lowering the lamp 6. The end of the cord is secured in a tubular plug 7, into the lower end of which is screwed the hook 8, on which thelamp is hung. Attached to or integral with the pendant 1 is a socket 9, into which the plug enters when the lamp is raised. The plug and socket are provided with means for automatically fastening and unfastening them The means I prefer comprises a pin, 10, projecting radially into the socket from one side thereof and cooperating with a cam-shoulder 11 on the plug. Saidshoulder encircles .the plug obliquely, terminating at one end in a tongue 12,

standing at a higher point on the plug than to a notch 15, and then up longitudinally of the plug. The shoulder 11 after passing the notch 13 runs nearly parallel with the under side of the tongue, forming withit a W-shaped groove. The operation of these parts is as follows: When the lamp is raised by the cord, the plug enters the socket, and as soon as the shoulder strikes the pin the plug is partially rotated until as the shoulder slides past the pin the notch 13 is brought up against the pin and the upward movement of the plug is checked. The cord is then slacked away and the under side of the tongue 12 comes in contact with the pin, causing the plug to rotate still further until the pin comes into the notch 14, where it arrests the motion of the plug both angu'larly and longitudinally. The lamp is thus suspended on the pin. To lower it, the cord is pulled again, raising the plug until the notch 15 comes against it, whereupon by slacking 011? the cord the plug and the lamp will drop, the pin passing up through the vertical part of the slot.

The line-terminals are connected with two metallic ears 16 17 secured to an annular block 18, of insulation, attached to and concentric with the socket 9. From the ear 16 extends a spring-arm 19, carrying a contact 20, the other ear having a similar spring-arm 19 and contact The two contacts press against each other and keep the main line closed when the lamp is lowered. out of the hanger. The lamp'terminals are connected with two metallic ears 21 22, secured to an annular block 23 of insulation attached to and concentric with the plug 7. The ear 21 carries a spring-contact 24, adapted to slide under and lift the upper spring-arm 19 when the lamp is raised into the hanger. The other ear has a spring-contact25, adapted to make contact with a similar spring 26, connected with the ear 17. When the lamp is pulled up into place, the line-circuit is broken at the contacts 20 20 and the lamp-terminals are put in connection with the line-terminals by means of the springs 19 24 and 25 26. The contacts are protected from the weather and from dust by a petticoat 27, depending from the base of the socket.

What I claim as new, and desire to secure by Letters Patent of the United States, is

1. An arc-lamp hanger comprising a socket and a freely-rotatable plug, and means for automatically alining the respective parts and engaging them when the plug passes up into the socket and for disengaging them by a slight upward movement of the plug.

2. An arc-lamp hanger comprising a socket containing a pin, and a freely-rotatable plug having a cam-shoulder and notches to engage with said pin, whereby the respective parts may be alinecl and the plug can be attached to and detached from the socket by successive upward movements.

3. The combination with a socket having a pin projecting radially into it, of a plug having a cam-shoulder adapted to engage with said pin and thereby aline the respective parts and hold the plug in engagement with the socket.

4c. The combination with a socket having a pin projecting radially into it, of a plug having an oblique shoulder running down into a notch, then upwardly and downwardly into a second notch, and then up longitudinally of the plug, and atonguc extending over the first notch and having its under side running up to a notch and then downwardly and again upwardly, whereby said pin will be guided from notch to notch as it slides along the shoulder.

5. The combination with a pendant, of a pulley housed therein, a socket depending from said pendant and carrying a pin, a tubular plug entering said socket, a cord passing over said pulley and secured in said plug, and cam-shoulders and notches on the plug interoperating with the pin in the socket to successively engage and disengage the plug and socket when the cord is pulled.

6. In an arc-lamp hanger, the combination with a socket, of line-terminals carried thereby, means for automatically connecting said terminals when no lamp is attached to the socket, a freely-rotatable plug attached to the lamp and adapted to enter said socket, lampterminals carried by said plug, and means for automatically alining the respective parts and disconnecting. the line-terminals and connecting them with the lamp-terminals when the plug is inserted in the socket.

7. In an arc-lamp hanger, the combination with a socket, of an annular block of insulation concentric therewith, line-terminals on said block, spring-arms normally connecting said terminals, a plug attached to the lamp and adapted to enter said socket, an annular block of insulation concentric with said plug, lampterminals on said last-named block, and springcontacts connected with said lamp-terminals and making contact with the line-terminals when the plug is inserted in the socket.

In witness whereof I have hereunto set my hand this 29th day of August, 1902.

HOWVARD R. SARGENT.

WVitnesses:

EDWARD VILLIAMS, J r., GEORGE F. THORNTON. 

